ABSTRACTS OF TECHNICAL ARTICLES 161 



this experiment will aid in developing a standard rural radiotelephone 

 system. 



Efect of Passive Modes in Traveling-Wave Tubes}- J. R. I'ikrce. As 

 the beam current in a traveling-wave tube is increased, the local fields due 

 to the bunched beam become appreciable compared with the llelds propa- 

 gating along the circuit. The eflfect is to reduce gain, to increase the electron 

 speed for optimum gain, to introduce a lower limit to the range of electron 

 speeds for which gain is obtained, and to change the initial loss. 



New Test Equipment and Testing Methods for Cable Carrier Systems^ 

 W. H. TiDD, S. Rosen and H. A. Wexk. Three portable test sets developed 

 for the improved cable carrier telephone system are described : A high sen- 

 sitivity selective transmission measuring set covering 10 to 150 kc, a decade 

 oscillator for frequencies from 2 to 79 kc, and a tube test set. 



.4 New Microwave Television System}* J. F. Wentz and K. D. Smith. 

 A microwave point-to-point radio system is described which is designed for 

 the transmission of television programs. This system is intended to sup- 

 plement wire facilities for local distribution of television signals from pickup 

 points to studios or from studios to broadcast transmitters and to long dis- 

 tance network terminals. The circuits and equipment are described in 

 detail. Performance obtained in tests during 1946 is given. 



12 Proc. I. R. E., August 1948 (pp. 993-997). 



■3 Trans. A.I. E. E., vol. 66, 1947 (pp. 726-730). 



'* Transactions, A. I.E. E., vol. 66, 1947 (pp. 465-470). 



